[CV32E40Pv2] Bit Manipulation instructions

Created by: pascalgouedo

The encoding is incorrect for all Bit Manipulation instructions. Is2 and Is3 are interchanged in final bit encoding. Maybe because they are declared differently than other instructions : ... rD, rs1, Is3, Is2

This different instruction presentation is because this is easier to understand what is extracted: Is3 is most significant bit and Is2 is least significant bit.